I think I did miss the release of Sword in the Stone, which means I gotta wait. 
Nah, Sword in the Stone is still out.
The only ones you have to watch out for are the limited Platinum Editions which are released every 6 months and are only in production for that time frame. Also they are re-released every 7 years... I think it's 7 years.
Fox and the Hound is also out, it was just re-released as special edition like the AristoCats.
Anyway, here's a list of the limited ones:
Snow White and the Seven Dwarfs (No longer available)
Beauty and the Beast (No longer available)
The Lion King (No longer available)
Aladdin (No longer available)
Bambi (No longer available)
Cinderella (No longer available)
Lady and the Tramp (No longer available)
The Little Mermaid (No longer available)
Peter Pan (No longer available)
The Jungle Book (No longer available)
101 Dalmatians (Out Now)
Sleeping Beauty (2nd half of '08)
EDIT: Sword in the Stone is being re-released this year, supposedly. That may explain the lack of it in stores, so you may want to hold off on getting it.